/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.harmony.security.x509;

import org.apache.harmony.security.asn1.ASN1Oid;
import org.apache.harmony.security.asn1.ASN1Sequence;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.asn1.ObjectIdentifier;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with the
 * AccessDescription which is a part of X.509 framework (as specified in RFC
 * 3280 - Internet X.509 Public Key Infrastructure. Certificate and Certificate
 * Revocation List (CRL) Profile. http://www.ietf.org/rfc/rfc3280.txt):
 * 
 * AccessDescription ::= SEQUENCE { accessMethod OBJECT IDENTIFIER,
 * accessLocation GeneralName }
 * 
 */
public class AccessDescription {

	// the value of access method
	private final String accessMethod;

	// the value of accessLocation
	private final GeneralName accessLocation;

	private byte[] encoding;

	/**
	 * Custom AccessDescription DER encoder/decoder
	 */
	public static final ASN1Sequence ASN1 = new ASN1Sequence(new ASN1Type[] {
			ASN1Oid.getInstance(), GeneralName.ASN1 }) {

		@Override
		protected Object getDecodedObject(BerInputStream in) {
			final Object[] values = (Object[]) in.content;
			return new AccessDescription(
					ObjectIdentifier.toString((int[]) values[0]),
					(GeneralName) values[1], in.getEncoded());
		}

		@Override
		protected void getValues(Object object, Object[] values) {

			final AccessDescription ad = (AccessDescription) object;

			values[0] = ObjectIdentifier.toIntArray(ad.accessMethod);
			values[1] = ad.accessLocation;
		}
	};

	public AccessDescription(String accessMethod, GeneralName accessLocation) {
		this.accessMethod = accessMethod;
		this.accessLocation = accessLocation;
	}

	private AccessDescription(String accessMethod, GeneralName accessLocation,
			byte[] encoding) {
		this.accessMethod = accessMethod;
		this.accessLocation = accessLocation;
		this.encoding = encoding;
	}

	/**
	 * @return Returns the accessLocation.
	 */
	public GeneralName getAccessLocation() {
		return accessLocation;
	}

	/**
	 * @return Returns the accessMethod.
	 */
	public String getAccessMethod() {
		return accessMethod;
	}

	/**
	 * Returns ASN.1 encoded form of this X.509 AccessDescription.
	 * 
	 * @return a byte array containing ASN.1 encoded form.
	 */
	public byte[] getEncoded() {
		if (encoding == null) {
			encoding = ASN1.encode(this);
		}
		return encoding;
	}

	@Override
	public String toString() {
		final StringBuilder res = new StringBuilder();
		res.append("\n-- AccessDescription:"); //$NON-NLS-1$
		res.append("\naccessMethod:  "); //$NON-NLS-1$
		res.append(accessMethod);
		res.append("\naccessLocation:  "); //$NON-NLS-1$
		res.append(accessLocation);
		res.append("\n-- AccessDescription END\n"); //$NON-NLS-1$
		return res.toString();
	}

}
